The Wonderful Wizard of Oz started as a perfect partnership between writer L. Frank Baum and illustrator W. W. Denslow. But they became bitter rivals, with each owning half the copyright to the 1900 book. Baum put his nose to the grindstone trying to build a franchise while Denslow took a more colorful and ultimately self-destructive path. I talk with Michael Patrick Hearn, who wrote biographies of both men.You can hear more from Michael at Studio 360's American Icon episode about The Wizard of Oz.